active X-over

??? Is your crossover for the sub/main separation? If so, then the Revel crossovers must remain intact and will not interact with it.

Setting your main speakers to large is, of course, necessary.

Of course, all this suggests that you are NOT using the bass management in your prepro, so I have to ask why not? What do you hope to gain by using the external crossover?

Kal

Yes but you haven't said why you are not simply using the bass management in your prepro. Also, can we assume you are using the EQ in the Velodyne?

Kal

To me the signal has to go thru the prepros bass management(
or not)or the subs bass maagement.I could be wrong,but if the signal goes thru the 10B,I'm hoping for more quality.To me it's like replacing a average component and upgrading to something of way higher quality and hopefully quality bass while freeing up my mains of lowend.

If you are passing the signals through the pre/pros DSP, it will make little difference to the signal "quality" (whatever that means) if you choose or avoid a simple function like bass management. I do not know what prepro you are using but I can think of many better ways to use the money you are spending on the 10B. (Not that I dislike that device but I would see it as more appropriate in an entirely analog system.)

Kal